Learning goals: Teacher Facing Calculate the difference between the mean or median of two samples from different populations, and express it as a multiple of the MAD or IQR. Interpret a pair of box plots, including the amount of visual overlap between the two distributions. Justify (orally and in writing) whether there is likely to be a meaningful difference between two populations, based on a sample from each population. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.8 Probability and Sampling, Grade 7.